Oracle PL/SQL/Object Oriented Database/Ref

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Column "REF" an object type

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SQL> SQL> CREATE OR REPLACE TYPE address AS OBJECT (

 2    street_1      VARCHAR2(40),
 3    street_2      VARCHAR2(40),
 4    city          VARCHAR2(40),
 5    state_abbr    VARCHAR2(2),
 6    zip_code      VARCHAR2(5),
 7    phone_number  VARCHAR2(10),
 8    MEMBER PROCEDURE ChangeAddress (
 9      st_1 IN VARCHAR2, st_2 IN VARCHAR2, cty IN VARCHAR2,
10      state IN VARCHAR2, zip IN VARCHAR2),
11    MEMBER FUNCTION getStreet (line_no IN number) RETURN VARCHAR2,
12    MEMBER FUNCTION getCity RETURN VARCHAR2,
13    MEMBER FUNCTION getStateAbbr RETURN VARCHAR2,
14    MEMBER FUNCTION getPostalCode RETURN VARCHAR2,
15    MEMBER FUNCTION getPhone RETURN VARCHAR2,
16    MEMBER PROCEDURE setPhone (newPhone IN VARCHAR2)
17  );
18  /

Type created. SQL> SQL> SQL> CREATE OR REPLACE TYPE BODY address AS

 2    MEMBER PROCEDURE ChangeAddress (
 3      st_1 IN VARCHAR2, st_2 IN VARCHAR2, cty IN VARCHAR2,
 4      state IN VARCHAR2, zip IN VARCHAR2) IS
 5    BEGIN
 6      IF (st_1 IS NULL) OR (cty IS NULL) OR
 7         (state IS NULL) OR (zip IS NULL)
 8         OR (upper(state) NOT IN ("AK","AL","AR","AZ","CA","CO",
 9                                  "CT","DC","DE","FL","GA","HI",
10                                  "IA","ID","IL","IN","KS","KY",
11                                  "LA","MA","MD","ME","MI","MN",
12                                  "MO","MS","MT","NC","ND","NE",
13                                  "NH","NJ","NM","NV","NY","OH",
14                                  "OK","OR","PA","RI","SC","SD",
15                                  "TN","TX","UT","VA","VT","WA",
16                                  "WI","WV","WY"))
17  OR (zip <> ltrim(to_char(to_number(zip),"09999"))) THEN
18       RAISE_application_error(-20001,"The new Address is invalid.");
19      ELSE
20        street_1 := st_1;
21        street_2 := st_2;
22        city := cty;
23        state_abbr := upper(state);
24        zip_code := zip;
25      END IF;
26    END;
27
28    MEMBER FUNCTION getStreet (line_no IN number)
29      RETURN VARCHAR2 IS
30    BEGIN
31      IF line_no = 1 THEN
32        RETURN street_1;
33      ELSIF line_no = 2 THEN
34        RETURN street_2;
35      ELSE
36        RETURN " ";   
37      END IF;
38    END;
39
40    MEMBER FUNCTION getCity RETURN VARCHAR2 IS
41    BEGIN
42      RETURN city;
43    END;
44
45    MEMBER FUNCTION getStateAbbr RETURN VARCHAR2 IS
46    BEGIN
47      RETURN state_abbr;
48    END;
49
50    MEMBER FUNCTION getPostalCode RETURN VARCHAR2 IS
51    BEGIN
52      RETURN zip_code;
53    END;
54
55    MEMBER FUNCTION getPhone RETURN VARCHAR2 IS
56    BEGIN
57      RETURN phone_number;
58    END;
59
60    MEMBER PROCEDURE setPhone (newPhone IN VARCHAR2) IS
61    BEGIN
62      phone_number := newPhone;
63    END;
64  END;
65  /

Type body created. SQL> set echo on SQL> SQL> SQL> CREATE OR REPLACE TYPE appartment AS OBJECT (

 2    BldgName          VARCHAR2(40),
 3    BldgAddress       address,
 4    BldgMgr           INTEGER,
 5    MEMBER PROCEDURE  ChangeMgr (NewMgr IN INTEGER),
 6    ORDER MEMBER FUNCTION Compare (OtherAppartment IN appartment)
 7        RETURN INTEGER
 8    );
 9  /

Type created. SQL> SQL> CREATE OR REPLACE TYPE BODY appartment AS

 2    MEMBER PROCEDURE  ChangeMgr(NewMgr IN INTEGER) IS
 3      BEGIN
 4        BldgMgr := NewMgr;
 5      END;
 6
 7    ORDER MEMBER FUNCTION Compare (OtherAppartment IN appartment)
 8    RETURN INTEGER IS
 9        BldgName1     VARCHAR2(40);
10        BldgName2     VARCHAR2(40);
11      BEGIN
12        BldgName1 := upper(ltrim(rtrim(BldgName)));
13        BldgName2 := upper(ltrim(rtrim(OtherAppartment.BldgName)));
14
15        IF BldgName1 = BldgName2 THEN
16          RETURN 0;
17        ELSIF BldgName1 < BldgName2 THEN
18          RETURN -1;
19        ELSE
20          RETURN 1;
21        END IF;
22      END;
23  END;
24  /

Type body created. SQL> CREATE TABLE employee(

 2           emp_id           INTEGER,
 3           emp_name         VARCHAR2(32),
 4           supervised_by    INTEGER,
 5           pay_rate         NUMBER(9,2),
 6           pay_type         CHAR,
 7           emp_bldg         REF appartment);

Table created. SQL> SQL> drop table employee; Table dropped. SQL> SQL> drop type appartment; Type dropped. SQL> --

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Create table with ref

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SQL> CREATE OR REPLACE TYPE address_obj as OBJECT(

 2        street VARCHAR2(20),
 3        city VARCHAR2(20),
 4        state CHAR(2),
 5        zip CHAR(5));
 6  /

Type created. SQL> SQL> CREATE TABLE address_table OF ADDRESS_OBJ; Table created. SQL> SQL> CREATE TABLE client (name VARCHAR2(20),

 2    address REF address_obj scope is address_table);

Table created. SQL> SQL> SQL> INSERT INTO client SELECT "Walsh", REF(aa) FROM address_table aa; 0 rows created. SQL> SQL> -- SELECTing Individual Columns in TCROs SQL> SQL> SQL> SELECT c.name, c.address.city FROM client c; no rows selected SQL> SQL> SQL> SQL> drop table client; Table dropped. SQL> SQL> drop table address_table; Table dropped. SQL> SQL>


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Delete records

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SQL> CREATE OR REPLACE TYPE address_obj as OBJECT(

 2        street VARCHAR2(20),
 3        city VARCHAR2(20),
 4        state CHAR(2),
 5        zip CHAR(5));
 6  /

Type created. SQL> SQL> CREATE TABLE address_table OF ADDRESS_OBJ; Table created. SQL> SQL> INSERT INTO address_table VALUES (ADDRESS_OBJ("1 A St.","Mobile","AL","36608")); 1 row created. SQL> SQL> CREATE TABLE client (name VARCHAR2(20),

 2    address REF address_obj scope is address_table);

Table created. SQL> SQL> INSERT INTO client SELECT "Walsh", REF(aa) FROM address_table aa; 1 row created. SQL> SQL> SQL> -- SELECTing Individual Columns in TCROs SQL>

SQL> SQL> SQL> -- Deleting Referenced Rows SQL> SQL> SQL> SELECT * FROM address_table; STREET CITY ST ZIP


-------------------- -- -----

1 A St. Mobile AL 36608

SQL> SQL> -- Now delete a row from Address_table: SQL> SQL> DELETE FROM address_table WHERE zip = "32563"; 0 rows deleted. SQL> SQL> -- And now, SELECT from the Client table that contains a reference to the Address_table: SQL> SQL> SELECT * FROM client; NAME ADDRESS


--------------------------------------------------

Walsh 0000220208707EBDF1B9E344FDB604B14DA624CBA048316BEA

         1E2D4128AC1F28472E126764

SQL> SQL> SELECT name, DEREF(address)

 2  FROM client;

NAME


DEREF(ADDRESS)(STREET, CITY, STATE, ZIP)


Walsh ADDRESS_OBJ("1 A St.", "Mobile", "AL", "36608")

SQL> SQL> SQL> SQL> drop table client; Table dropped. SQL> SQL> drop table address_table; Table dropped. SQL> SQL> SQL>


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Insert with ref

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SQL> CREATE OR REPLACE TYPE address_obj as OBJECT(

 2        street VARCHAR2(20),
 3        city VARCHAR2(20),
 4        state CHAR(2),
 5        zip CHAR(5));
 6  /

Type created. SQL> SQL> CREATE TABLE address_table OF ADDRESS_OBJ; Table created. SQL> SQL> INSERT INTO address_table VALUES (ADDRESS_OBJ("1 A St.","Mobile","AL","36608")); 1 row created. SQL> SQL> CREATE TABLE client (name VARCHAR2(20),

 2    address REF address_obj scope is address_table);

Table created. SQL> SQL> SQL> INSERT INTO client SELECT "Walsh", REF(aa) FROM address_table aa; 1 row created. SQL> SQL> -- SELECTing Individual Columns in TCROs SQL> SQL> SQL> SELECT c.name, c.address.city FROM client c; NAME ADDRESS.CITY


--------------------

Walsh Mobile SQL> SQL> SQL> SQL> drop table client; Table dropped. SQL> SQL> drop table address_table; Table dropped. SQL> SQL>


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List to list using object references

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SQL> CREATE OR REPLACE TYPE bookType AS OBJECT

 2     (book_id          VARCHAR2(10),
 3      book_title       VARCHAR2(30))
 4  /

Type created. SQL> SQL> CREATE OR REPLACE TYPE authorType AS OBJECT

 2     (author_id        VARCHAR2(10),
 3      author_name      VARCHAR2(30))
 4  /

Type created. SQL> SQL> CREATE TABLE Book OF bookType

 2     (book_id NOT NULL,
 3      PRIMARY KEY (book_id));

Table created. SQL> SQL> CREATE TABLE Author OF authorType

 2     (author_id NOT NULL,
 3      PRIMARY KEY (author_id));

Table created. SQL> SQL> CREATE TABLE Write

 2     (Book             REF bookType,
 3      Index_Book       NUMBER NOT NULL,
 4      Author           REF authorType);

Table created. SQL> SQL> CREATE TABLE Written_By

 2     (Author           REF authorType,
 3      Index_Author     NUMBER NOT NULL,
 4      Book             REF bookType);

Table created. SQL> SQL> SQL> drop type bookType force; Type dropped. SQL> drop type authorType force; Type dropped. SQL> SQL> SQL> drop table Book; Table dropped. SQL> drop table Author; Table dropped. SQL> drop table Write; Table dropped. SQL> drop table Written_By; Table dropped.



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MAKE_REF and user view

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SQL> SQL> SQL> create type addressType as object

 2  (Street  VARCHAR2(50),
 3   City    VARCHAR2(25),
 4   State   CHAR(2),
 5   Zip     NUMBER);
 6  /

SQL> create type personType as object

 2  (Name     VARCHAR2(25),
 3   Address  addressType);
 4  /

SQL> SQL> create table emp

 2  (cid NUMBER   primary key,
 3   Name        VARCHAR2(25),
 4   Street      VARCHAR2(50),
 5   City        VARCHAR2(25),
 6   State       CHAR(2),
 7   Zip         NUMBER);

SQL> SQL> SQL> create or replace type empType as object

 2  (cid NUMBER,
 3   Name        VARCHAR2(25),
 4   Street      VARCHAR2(50),
 5   City        VARCHAR2(25),
 6   State       CHAR(2),
 7   Zip         NUMBER);
 8  /

SQL> SQL> create view empView of empType

 2  with object OID (cid) as
 3  select cid, Name, Street, City, State, Zip
 4  from emp;

SQL> SQL> create table emp_CALL

 2  (cid   NUMBER,
 3   Call_Number   NUMBER,
 4   Call_Date     DATE,
 5   constraint emp_CALL_PK primary key (cid, Call_Number),
 6   constraint emp_CALL_FK foreign key (cid)references emp(cid));

SQL> SQL> SQL> create view empCallView as

 2  select MAKE_REF(empView, cid) cid,
 3         Call_Number,
 4         Call_Date
 5    from emp_CALL;

SQL> SQL> select DEREF(CCOV.cid)

 2    from empCallView CCOV
 3   where Call_Date = TRUNC(SysDate);

SQL> SQL> SQL> drop view empCallView; SQL> drop view empView; SQL> drop table emp_CALL; SQL> drop table emp; SQL> SQL> SQL> drop type personType; SQL> SQL> drop type addressType; SQL>



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